The following Wikipedia screenshot is doing the rounds:

A bachelor tax existed in Argentina around 1900. Men who could prove that they had asked a woman to marry them and had been rebuffed were exempt from the tax. In 1900, this gave rise to the phenomenon of "professional lady rejectors", women who for a fee would swear to the authorities that a man had proposed to them and they had refused. [wiki]

Possibly true, certainly entertaining, but the only source given is this article in the NY Post (not exactly a trusted primary source), itself drawing from the book "Rebellion, Rascals and Revenue: Tax Follies through the Ages" (by two economists, Michael Keen & Joe Slemrod). I searched in Spanish to find a closer source, but the only thing I could find was this 1903 article in the Taranaki Herald, a New Zealand newspaper which in turn got it from the New York Press.

Any better sources? I must know the truth. Spanish okay and indeed welcome.